Engine sputters under load
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Engine sputters under load
I bought a 84 LTD that sat in a field for a few years. I replaced the fuel pump, inline filter, and cleaned out the tank but not real good. The engine idles smooth. Accelerating slowly it runs good. With hard acceleration it sputters. And higher than 30 mph it sputters. When I let off the gas it quits sputtering. After driving a few minutes the engine light comes on. This car is a Crown Vic with a CFI fuel system. Does anybody have any ideas.
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Joined: Sep 2003
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From: Colorado
Sounds like a misfire to me, have you checked the ignition system? Dist. cap, rotor, wires, plugs? If it was in a field for a few years, there could be buildups on the cap and rotor terminals causing crappy current flow. What does the oil pressure do under high and low loads?
I had a chevy car once which sat in the driveway among a lot of brush... damn mice got in there and ate up the spark plug wires. I went to start it one day and I heard all this sparking under the hood, and it wouldnt start!!
I had a chevy car once which sat in the driveway among a lot of brush... damn mice got in there and ate up the spark plug wires. I went to start it one day and I heard all this sparking under the hood, and it wouldnt start!!
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I don't have an oil pressure guage so I don't really know what the pressure does under load. I haven't looked inside the distributor yet but I will. It doesn't feel like a vacuum advance problem because it don't bog down when you put your foot in it. It dont seem like a bad plug or wire becuase it would have to be a few bad wires that don't miss during idle. I will check the wires and plugs. It sputters really rough with the RPMs up under load. I can't figgure if it is the fuel or the electronics. I'm open to all suggestions.
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Yep, I understood machanical advance. That just made me think of vacuum advance. Which I didn't check either. I can't tell the difference when I'm driving. I'm going to check all suggestions when I get back to the car. It's at my brother-in-laws house, 70 miles away.
Senior User
Joined: Sep 2002
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From: Calgary Alberta
Im assuming it has a carb. Sputtering under load may be plugged jets. If it is carborated try running some injector cleaner through. You can run injector cleaner in a carb but NOT carb cleaner with injectors. If this turns out to help tear down the carb and clean it.
Check the air filter too, every little bit helps :-)
Good luck
Check the air filter too, every little bit helps :-)
Good luck
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It has central fuel injection (CFI) system. Two injectors in a throttle body that looks like a carb. I don't know how long Ford used this system? I already put carb cleaner through it. Did I mess up?
Senior User
Joined: Sep 2002
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From: Calgary Alberta
Well, I was told that if you run a carborator cleaner through an engine with injectors, then the carborater cleaner can ruin the injectors because of the materials they are made with. I beleive it causes the seals in the injectors to deteriorate. Your best bet is to stick with injector cleaner for anything that runs injectors. Can anyone confirm this? I was told by a guy that works at an automotive parts store, but he might have been full of it- I cant say for sure.
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